Fix search bar background

lawnchair/res/values/config.xml

@@ -23,6 +23,8 @@
     <string name="main_process_initializer_class" translatable="false">app.lawnchair.LawnchairProcessInitializer</string>
     <string name="task_overlay_factory_class" translatable="false">app.lawnchair.overview.TaskOverlayFactoryImpl</string>
 
+    <bool name="config_header_protection_supported">true</bool>
+
     <string-array name="filtered_components">
         <!-- Voice search -->
         <item>com.google.android.googlequicksearchbox/.VoiceSearchActivity</item>

lawnchair/src/app/lawnchair/allapps/AllAppsSearchInput.kt

@@ -228,4 +228,12 @@ class AllAppsSearchInput(context: Context, attrs: AttributeSet?) : LinearLayout(
     }
 
     override fun getEditText() = input
+
+    override fun setBackgroundVisibility(visible: Boolean, maxAlpha: Float) {
+        input.setBackgroundVisibility(visible, maxAlpha)
+    }
+
+    override fun getBackgroundVisibility(): Boolean {
+        return input.getBackgroundVisibility()
+    }
 }

lawnchair/src/app/lawnchair/allapps/FallbackSearchInputView.kt

@@ -1,5 +1,6 @@
 package app.lawnchair.allapps
 
+import android.animation.ValueAnimator
 import android.annotation.SuppressLint
 import android.content.Context
 import android.graphics.Rect
@@ -11,19 +12,16 @@ import app.lawnchair.theme.drawable.DrawableTokens
 import app.lawnchair.util.EditTextExtensions.setCursorColor
 import app.lawnchair.util.EditTextExtensions.setTextSelectHandleColor
 import com.android.launcher3.ExtendedEditText
+import com.android.launcher3.Utilities
 import com.android.launcher3.allapps.AllAppsContainerView
 
 class FallbackSearchInputView(context: Context, attrs: AttributeSet?) : ExtendedEditText(context, attrs) {
 
     private var appsView: AllAppsContainerView? = null
-    private var shown = true
-        set(value) {
-            if (field != value) {
-                field = value
-                updateBackground()
-            }
-        }
     private val bg = DrawableTokens.SearchInputFg.resolve(context)
+    private val bgAlphaAnimator = ValueAnimator.ofFloat(0f, 1f).apply { duration = 300 }
+    private var bgVisible = true
+    private var bgAlpha = 1f
 
     init {
         background = bg
@@ -32,27 +30,24 @@ class FallbackSearchInputView(context: Context, attrs: AttributeSet?) : Extended
         setCursorColor(accentColor)
         setTextSelectHandleColor(accentColor)
         highlightColor = ColorUtils.setAlphaComponent(accentColor, 82)
+
+        bgAlphaAnimator.addUpdateListener { updateBgAlpha() }
+    }
+
+    private fun updateBgAlpha() {
+        val fraction = bgAlphaAnimator.animatedFraction
+        bg.alpha = (Utilities.mapRange(fraction, 0f, bgAlpha) * 255).toInt()
     }
 
     fun initialize(appsView: AllAppsContainerView) {
         this.appsView = appsView
     }
 
-    private fun updateBackground() {
-        val showBackground = shown && !isFocused
-        background = if (showBackground) bg else null
-    }
-
     override fun hideKeyboard() {
         super.hideKeyboard()
         this.appsView?.requestFocus()
     }
 
-    override fun onFocusChanged(focused: Boolean, direction: Int, previouslyFocusedRect: Rect?) {
-        super.onFocusChanged(focused, direction, previouslyFocusedRect)
-        updateBackground()
-    }
-
     override fun onAttachedToWindow() {
         super.onAttachedToWindow()
         if (layoutDirection == LAYOUT_DIRECTION_RTL) {
@@ -60,4 +55,24 @@ class FallbackSearchInputView(context: Context, attrs: AttributeSet?) : Extended
             gravity = Gravity.RIGHT or Gravity.CENTER
         }
     }
+
+    fun setBackgroundVisibility(visible: Boolean, maxAlpha: Float) {
+        if (bgVisible != visible) {
+            bgVisible = visible
+            bgAlpha = maxAlpha
+            if (visible) {
+                bgAlphaAnimator.start()
+            } else {
+                bgAlphaAnimator.reverse()
+            }
+        } else if (bgAlpha != maxAlpha && !bgAlphaAnimator.isRunning && visible) {
+            bgAlpha = maxAlpha
+            bgAlphaAnimator.setCurrentFraction(maxAlpha)
+            updateBgAlpha()
+        }
+    }
+
+    fun getBackgroundVisibility(): Boolean {
+        return bgVisible
+    }
 }